Startup of multiple Guests

DISCUSSION Dan Johansson 2 participants 2 messages May 2, 2010 – May 3, 2010 KVM

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Dan Johansson

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2010-05-02 13:14 UTC #0 lore raw

Hi, It's me again.

After some time with a lot to do outside the computer world, I am now continuing my "KVM-Project". I have gotten all my KVM-Guest to run separately, but when I try to start more then one at the same time I get the following error message and the second Guest does not start:

warning: could not configure /dev/net/tun: no virtual network emulation

The scripts used to start the Guests looks like this:
Guest-A:

kvm \
        -net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:04 -net 
tap,vlan=1,ifname=qtap1,script=no,downscript=no \
        -net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:04 -net 
tap,vlan=3,ifname=qtap3,script=no,downscript=no \
        -m 2048 -k de-ch -vnc :4 -daemonize \
        Robbie.qcow2

Guest-B:

kvm \
        -net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:03 -net 
tap,vlan=1,ifname=qtap1,script=no,downscript=no \
        -net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:03 -net 
tap,vlan=3,ifname=qtap3,script=no,downscript=no \
        -m 2048 -k de-ch -vnc :3 -daemonize \
        Wilmer.qcow2

I suspect that something is not 100% correct with my network setup. I want both of the Guest to be able to access the same qtap's (1 and 3). br1 = qtap1 + eth1
br3 = qtap3 + eth3

Is it not possible to use the same qtap for two different Guests? Do I need to setup one qtap for each Guste and configure it like this:
br1 = qtap1a + qtap1b + eth1

Just asking for some advice before I start fiddling around with my network- setup again. (;-)

Regards,

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Dan Johansson, <http://www.dmj.nu>
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Amos Kong

2010-05-03 04:50 UTC #1 lore raw

Quoted 28 lines · Dan Johansson

Hi, It's me again.
After some time with a lot to do outside the computer world, I am now continuing my "KVM-Project". I have gotten all my KVM-Guest to run separately, but when I try to start more then one at the same time I get the following error message and the second Guest does not start:
warning: could not configure /dev/net/tun: no virtual network emulation
The scripts used to start the Guests looks like this:
Guest-A:
kvm \
-net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:04 -net tap,vlan=1,ifname=qtap1,script=no,downscript=no \
-net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:04 -net tap,vlan=3,ifname=qtap3,script=no,downscript=no \
-m 2048 -k de-ch -vnc :4 -daemonize \
Robbie.qcow2
Guest-B:
kvm \
-net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:03 -net tap,vlan=1,ifname=qtap1,script=no,downscript=no \
-net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:03 -net tap,vlan=3,ifname=qtap3,script=no,downscript=no \
-m 2048 -k de-ch -vnc :3 -daemonize \
Wilmer.qcow2

Quoted 6 lines

I suspect that something is not 100% correct with my network setup. I want both of the Guest to be able to access the same qtap's (1 and 3). br1 = qtap1 + eth1
br3 = qtap3 + eth3
Is it not possible to use the same qtap for two different Guests?

No, all the 'ifname' should be different.

try this:
--------
Guest-A:

kvm \
       -net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:04 -net
tap,vlan=1,ifname=qtap1,script=no,downscript=no \
       -net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:04 -net
tap,vlan=3,ifname=qtap3,script=no,downscript=no \
       -m 2048 -k de-ch -vnc :4 -daemonize \
       Robbie.qcow2

Guest-B:

kvm \
       -net nic,vlan=1,model=rtl8139,macaddr=DE:ED:BE:EF:01:03 -net
tap,vlan=1,ifname=qtap1b,script=no,downscript=no \
       -net nic,vlan=3,model=rtl8139,macaddr=DE:ED:BE:EF:03:03 -net
tap,vlan=3,ifname=qtap3b,script=no,downscript=no \
       -m 2048 -k de-ch -vnc :3 -daemonize \
       Wilmer.qcow2